I have recently bought a black moor and fantail goldfish. If it wasn't for coming on here i wouldn't have known our tank is too small for them. My question is would a 90 litre tank be big enough for my 2 fish and would i have to empty it every week/month to clean it properly .

90 liter would technically work but if you're buying a new one I'd get a bit bigger. You will have to change out 50-70% of the water weekly and vacuum the gravel. Please read up on cycling your tank and there is also a great thread on maitanence.

Earlier I kept two fantails in a 100 liter tank, that would be ideal for them since there would technically be 20 liters of extra space for them, and a 100 liter tank is pretty small still and easy to maintain It's also one of the more standard sizes so it would be easier to find. How big is the current tank by the way?

Here are the two threads that cheri mentioned:x (Link is not visible to guests. Please register to view.)
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Im not sure how big my current one is but its small. Im looking for a new one at the moment so it will only be a temporary tank. Thanks for the links i had a look at them earlier but i was a bit confused. Ive just had a look again and they make better sense on a second read.

We got it at a good price. Can't wait to get it, ill have to resist the urge to put the fish in straight away. Me and my partner think that just the 2 fish will be fine for us. I love watching them swim around. Also which live plants would be good for the health of the tank and the fish?

Java ferns and Anubis are easy and the fish won't eat them, they do well in low light. I also have large bunches of elodea but the fish eat it and it kind of makes a mess and takes a long time to root.

I'm so glad you were so quick to get a new tank! Most people spend awhile in denial before listening to forum members. Good luck with your babies. Check out the feeding tips too, a lot of newbies make the mistake of feeding just pellets or flakes with no variety.

You could also try adding some cryptocorynes to your tank, they grow really tall so they'd make good background plants Anubias come in different sizes by the way, and Anubias Nana (dwarf anubias) or Anubias Barterii (Barter's anubias) are both pretty suitable for those smaller tanks

I also have a tall something in my tank that I can't identify, but looks really pretty xD

Aside from the veggies you could try getting some blood worms or shrimp for the goldfish Protein is especially important for small goldfish And just in case, while you feed them with flakes, you shouldn't drop them onto the surface but rather take a grip around a pinch and lower it below the water line, that way they won't swallow so much air and the flakes will be easier for them eat. Not to mention that they'll have a lot of fun chasing the drifting flakes around the tank

With plants, I've tried Cabomba and it got eaten!I have a nice bunch of Elodea Densa, that I just love, it has grown roots all over the place and the plant itself has grown quite nicely in places, although it does get nibbled, I'm hoping it'll grow fast enough to keep up with my goldfish

I peel a bit of orange and give it to Sebastian. He tears the little pieces up and makes a mess. He sometimes eats a nibble of bandanna, and sometimes a bit of raspberry. Other than that he doesn't care for fruit much.

Other things we have tried is cucumber, spinach, broccolli, brussel sprouts, corn without the skin and peas without the skin. And sweet potato. Small pieces only. His regular food is the color enhancing gelfood, and veggies. He loves it and looks great.He also goes wild for algea tabs.